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Comparing libecb/ecb.h (file contents):
Revision 1.23 by root, Thu May 26 19:40:09 2011 UTC vs.
Revision 1.36 by root, Sat Jun 11 13:25:52 2011 UTC

1/* 1/*
2 * libecb - http://software.schmorp.de/pkg/libecb 2 * libecb - http://software.schmorp.de/pkg/libecb
3 * 3 *
4 * Copyright (©) 2009-2011 Marc Alexander Lehmann 4 * Copyright (©) 2009-2011 Marc Alexander Lehmann <libecb@schmorp.de>
5 * Copyright (©) 2011 Emanuele Giaquinta 5 * Copyright (©) 2011 Emanuele Giaquinta
6 * All rights reserved. 6 * All rights reserved.
7 * 7 *
8 * Redistribution and use in source and binary forms, with or without modifica- 8 * Redistribution and use in source and binary forms, with or without modifica-
9 * tion, are permitted provided that the following conditions are met: 9 * tion, are permitted provided that the following conditions are met:
… …
47# endif 47# endif
48#endif 48#endif
49 49
50#ifndef __cplusplus 50#ifndef __cplusplus
51# if __STDC_VERSION__ >= 199901L 51# if __STDC_VERSION__ >= 199901L
52# define ECB_INLINE inline 52# define ECB_INLINE static inline
53typedef _Bool ecb_bool; 53typedef _Bool ecb_bool;
54# else 54# else
55# define ECB_INLINE inline /* yeah! */ 55# define ECB_INLINE static inline /* yeah! */
56typedef int ecb_bool; 56typedef int ecb_bool;
57# endif 57# endif
58#else
59# define ECB_INLINE static inline
60typedef bool ecb_bool;
58#endif 61#endif
59 62
60#define ECB_CONCAT_(a, b) a ## b 63#define ECB_CONCAT_(a, b) a ## b
61#define ECB_CONCAT(a, b) ECB_CONCAT_(a, b) 64#define ECB_CONCAT(a, b) ECB_CONCAT_(a, b)
62#define ECB_STRINGIFY_(a) # a 65#define ECB_STRINGIFY_(a) # a
63#define ECB_STRINGIFY(a) ECB_STRINGIFY_(a) 66#define ECB_STRINGIFY(a) ECB_STRINGIFY_(a)
64 67
65#define ECB_HEADER_INLINE static ECB_INLINE 68#define ECB_HEADER_INLINE ECB_INLINE
66 69
67#if ECB_GCC_VERSION(3,1) 70#if ECB_GCC_VERSION(3,1)
68# define ecb_attribute(attrlist) __attribute__(attrlist) 71# define ecb_attribute(attrlist) __attribute__(attrlist)
69# define ecb_is_constant(expr) __builtin_constant_p (expr) 72# define ecb_is_constant(expr) __builtin_constant_p (expr)
70# define ecb_expect(expr,value) __builtin_expect ((expr),(value)) 73# define ecb_expect(expr,value) __builtin_expect ((expr),(value))
… …
81# define ecb_decltype(x) __decltype(x) 84# define ecb_decltype(x) __decltype(x)
82#elif ECB_GCC_VERSION(3,0) 85#elif ECB_GCC_VERSION(3,0)
83# define ecb_decltype(x) typeof(x) 86# define ecb_decltype(x) typeof(x)
84#endif 87#endif
85 88
86#define ecb_noinline ecb_attribute ((noinline)) 89#define ecb_noinline ecb_attribute ((__noinline__))
87#define ecb_noreturn ecb_attribute ((noreturn)) 90#define ecb_noreturn ecb_attribute ((__noreturn__))
88#define ecb_unused ecb_attribute ((unused)) 91#define ecb_unused ecb_attribute ((__unused__))
89#define ecb_const ecb_attribute ((const)) 92#define ecb_const ecb_attribute ((__const__))
90#define ecb_pure ecb_attribute ((pure)) 93#define ecb_pure ecb_attribute ((__pure__))
94
95#if ECB_GCC_VERSION(4,3)
96 #define ecb_artificial ecb_attribute ((__artificial__)) /* 4.3 */
91#define ecb_hot ecb_attribute ((hot)) /* 4.3 */ 97 #define ecb_hot ecb_attribute ((__hot__)) /* 4.3 */
92#define ecb_cold ecb_attribute ((cold)) /* 4.3 */ 98 #define ecb_cold ecb_attribute ((__cold__)) /* 4.3 */
99#else
100 #define ecb_artificial
101 #define ecb_hot
102 #define ecb_cold
103#endif
93 104
94/* put into if's if you are very sure that the expression */ 105/* put into if's if you are very sure that the expression */
95/* is mostly true or mosty false. note that these return */ 106/* is mostly true or mostly false. note that these return */
96/* booleans, not the expression. */ 107/* booleans, not the expression. */
97#define ecb_unlikely(expr) ecb_expect (!!(expr), 0) 108#define ecb_expect_false(expr) ecb_expect (!!(expr), 0)
109#define ecb_expect_true(expr) ecb_expect (!!(expr), 1)
110/* for compatibility to the rest of the world */
98#define ecb_likely(expr) ecb_expect (!!(expr), 1) 111#define ecb_likely(expr) ecb_expect_true (expr)
112#define ecb_unlikely(expr) ecb_expect_false (expr)
99 113
100/* try to tell the compiler that some condition is definitely true */ 114/* try to tell the compiler that some condition is definitely true */
101#define ecb_assume(cond) do { if (!(cond)) ecb_unreachable (); } while (0) 115#define ecb_assume(cond) do { if (!(cond)) ecb_unreachable (); } while (0)
102 116
103/* count trailing zero bits and count # of one bits */ 117/* count trailing zero bits and count # of one bits */
104#if ECB_GCC_VERSION(3,4) 118#if ECB_GCC_VERSION(3,4)
105#define ecb_ctz32 (x) __builtin_ctz (x) 119 #define ecb_ctz32(x) __builtin_ctz (x)
106#define ecb_popcount32 (x) __builtin_popcount (x) 120 #define ecb_popcount32(x) __builtin_popcount (x)
107#else 121#else
108ECB_HEADER_INLINE int ecb_ctz32 (uint32_t x) ecb_const; 122 ECB_HEADER_INLINE int ecb_ctz32 (uint32_t x) ecb_const;
109ECB_HEADER_INLINE 123 ECB_HEADER_INLINE int
110ecb_ctz32 (uint32_t x) 124 ecb_ctz32 (uint32_t x)
111{ 125 {
112 int r = 0; 126 int r = 0;
113 127
114 x &= -x; /* this isolates the lowest bit */ 128 x &= -x; /* this isolates the lowest bit */
115 129
116 if (x & 0xaaaaaaaa) r += 1; 130 if (x & 0xaaaaaaaa) r += 1;
117 if (x & 0xcccccccc) r += 2; 131 if (x & 0xcccccccc) r += 2;
118 if (x & 0xf0f0f0f0) r += 4; 132 if (x & 0xf0f0f0f0) r += 4;
119 if (x & 0xff00ff00) r += 8; 133 if (x & 0xff00ff00) r += 8;
120 if (x & 0xffff0000) r += 16; 134 if (x & 0xffff0000) r += 16;
121 135
122 return r; 136 return r;
123} 137 }
124 138
125ECB_HEADER_INLINE int ecb_popcount32 (uint32_t x) ecb_const; 139 ECB_HEADER_INLINE int ecb_popcount32 (uint32_t x) ecb_const;
126ECB_HEADER_INLINE 140 ECB_HEADER_INLINE int
127ecb_popcount32 (uint32_t x) 141 ecb_popcount32 (uint32_t x)
128{ 142 {
129 x -= (x >> 1) & 0x55555555; 143 x -= (x >> 1) & 0x55555555;
130 x = ((x >> 2) & 0x33333333) + (x & 0x33333333); 144 x = ((x >> 2) & 0x33333333) + (x & 0x33333333);
131 x = ((x >> 4) + x) & 0x0f0f0f0f; 145 x = ((x >> 4) + x) & 0x0f0f0f0f;
132 x *= 0x01010101; 146 x *= 0x01010101;
133 147
134 return x >> 24; 148 return x >> 24;
135} 149 }
136#endif 150#endif
137 151
138#if ECB_GCC_VERSION(4,3) 152#if ECB_GCC_VERSION(4,3)
139# define ecb_bswap32(x) __builtin_bswap32 (x) 153 #define ecb_bswap32(x) __builtin_bswap32 (x)
140# define ecb_bswap16(x) (__builtin_bswap32(x) >> 16) 154 #define ecb_bswap16(x) (__builtin_bswap32(x) >> 16)
141#else 155#else
142ECB_HEADER_INLINE uint32_t ecb_bswap32 (uint32_t x) ecb_const; 156 ECB_HEADER_INLINE uint32_t ecb_bswap32 (uint32_t x) ecb_const;
143ECB_HEADER_INLINE uint32_t 157 ECB_HEADER_INLINE uint32_t
144ecb_bswap32 (uint32_t x) 158 ecb_bswap32 (uint32_t x)
145{ 159 {
146 return (x >> 24) 160 return (x >> 24)
147 | ((x >> 8) & 0x0000ff00) 161 | ((x >> 8) & 0x0000ff00)
148 | ((x << 8) & 0x00ff0000) 162 | ((x << 8) & 0x00ff0000)
149 | (x << 24); 163 | (x << 24);
150} 164 }
151 165
152ECB_HEADER_INLINE uint32_t ecb_bswap16 (uint32_t x) ecb_const; 166 ECB_HEADER_INLINE uint32_t ecb_bswap16 (uint32_t x) ecb_const;
153ECB_HEADER_INLINE uint32_t 167 ECB_HEADER_INLINE uint32_t
154ecb_bswap16 (uint32_t x) 168 ecb_bswap16 (uint32_t x)
155{ 169 {
156 return ((x >> 8) & 0xff) 170 return ((x >> 8) & 0xff)
157 | ((x << 8) & 0x00ff0000) 171 | ((x << 8) & 0x00ff0000)
158 | (x << 24); 172 | (x << 24);
159} 173 }
160#endif 174#endif
161 175
162#if ECB_GCC_VERSION(4,5) 176#if ECB_GCC_VERSION(4,5)
163# define ecb_unreachable() __builtin_unreachable () 177 #define ecb_unreachable() __builtin_unreachable ()
164#else 178#else
165/* this seems to work fine, but gcc always emits a warning for it :/ */ 179 /* this seems to work fine, but gcc always emits a warning for it :/ */
166ECB_HEADER_INLINE void ecb_unreachable (void) ecb_noreturn; 180 ECB_HEADER_INLINE void ecb_unreachable (void) ecb_noreturn;
167ECB_HEADER_INLINE void ecb_unreachable (void) { } 181 ECB_HEADER_INLINE void ecb_unreachable (void) { }
168#endif 182#endif
169 183
170ECB_HEADER_INLINE unsigned char ecb_byteorder_helper (void) ecb_const; 184ECB_HEADER_INLINE unsigned char ecb_byteorder_helper (void) ecb_const;
171ECB_HEADER_INLINE unsigned char 185ECB_HEADER_INLINE unsigned char
172ecb_byteorder_helper (void) 186ecb_byteorder_helper (void)
… …
178ECB_HEADER_INLINE ecb_bool ecb_big_endian (void) ecb_const; 192ECB_HEADER_INLINE ecb_bool ecb_big_endian (void) ecb_const;
179ECB_HEADER_INLINE ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; }; 193ECB_HEADER_INLINE ecb_bool ecb_big_endian (void) { return ecb_byteorder_helper () == 0x11; };
180ECB_HEADER_INLINE ecb_bool ecb_little_endian (void) ecb_const; 194ECB_HEADER_INLINE ecb_bool ecb_little_endian (void) ecb_const;
181ECB_HEADER_INLINE ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; }; 195ECB_HEADER_INLINE ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == 0x44; };
182 196
197#if ECB_GCC_VERSION(3,0)
198 #define ecb_mod(m,n) ((m) % (n) + ((m) % (n) < 0 ? (n) : 0))
199#else
183#define ecb_mod(m, n) ((m) < 0 ? ((n) - (-(m) % (n))) : ((m) % (n))) 200 #define ecb_mod(m,n) ((m) < 0 ? ((n) - 1 - ((-1 - (m)) % (n))) : ((m) % (n)))
201#endif
184 202
185#if ecb_cplusplus_does_not_suck 203#if ecb_cplusplus_does_not_suck
186// does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm) 204 // does not work for local types (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm)
187template<typename T, int N> 205 template<typename T, int N>
188static inline int ecb_array_length (const T (&arr)[N]) 206 static inline int ecb_array_length (const T (&arr)[N])
189{ 207 {
190 return N; 208 return N;
191} 209 }
192#else 210#else
193#define ecb_array_length(name) (sizeof (name) / sizeof (name [0])) 211 #define ecb_array_length(name) (sizeof (name) / sizeof (name [0]))
194#endif 212#endif
195 213
196ECB_INLINE uint32_t ecb_rotr32 (uint32_t x, unsigned int count) ecb_const; 214ECB_INLINE uint32_t ecb_rotr32 (uint32_t x, unsigned int count) ecb_const;
197ECB_INLINE uint32_t 215ECB_INLINE uint32_t
198ecb_rotr32 (uint32_t x, unsigned int count) 216ecb_rotr32 (uint32_t x, unsigned int count)

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